<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    body{
      font-family: Microsoft YaHei, Helvetica Neue, Helvetica, STHeiTi, Arial, sans-serif;
      font-size: 12px;
    }
    *{
      margin: 0;
      padding: 0;
    }
    ul{
      list-style-type: none;/*去掉图标*/
      width: 1220px;
      margin: 0 auto;/*居中*/
      background-color: #666;
      overflow: hidden;
      padding: 10px 0;/*添加上下的间距10个像素*/
    }
    li{
      width: 224px;  /*(1220/5)=244 - 2*10=224*/
      margin: 0 10px;/*实现每个元素之间的间距*/
      background-color: white;
      float: left;
      border-radius: 5px;
      overflow: hidden;/*超出部分隐藏*/
    }
    img{
      width: 100%;/*上级li的宽度*/
    }
    .b_div{
      padding: 15px;
    }
    .b_div>a{
      height: 40px;
      display: block;/*为了修改宽高*/
      text-decoration: none;
      color: #333;
      font-size: 14px;
      line-height: 20px;
    }
    .free_span{
      color: #4f8dfe;
    }
    .count_span{
      color: #888;
      float: right;
    }
    .free_i{
      background-image: url("https://cdn.tmooc.cn/tmooc-web/css/img/state-free.png");
      width: 44px;
      height: 44px;
      position: absolute;
      top: 0;
      left: 0;
    }
    li{
      position: relative;/*做参照物*/

    }
    li:hover{
      bottom: 5px;
      /*设置元素阴影 x偏移值 y偏移值 浓度 范围 颜色*/
      box-shadow: 0 0 10px 5px red;
    }

  </style>
</head>
<body>
<ul>
  <li>
    <div class="t_div">
      <img src="https://cdn.tmooc.cn/bsfile//courseImg///f93f25fba0a84f72be47f5058f84a655.png" alt="">
    </div>
    <div class="b_div">
      <i class="free_i"></i>
      <a href="">Java高薪项目实战营</a>
      <div>
        <span class="free_span">免费</span>
        <span class="count_span">5,203报名</span>
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  </li>
  <li>
    <div class="t_div">
      <img src="https://cdn.tmooc.cn/bsfile//courseImg///c875e07de3204bffb6f1964786bcb88c.jpg" alt="">
    </div>
    <div class="b_div">
      <a href="">Java高薪项目实战营</a>
      <div>
        <span class="free_span">免费</span>
        <span class="count_span">5,203报名</span>
      </div>
    </div>
  </li>
  <li>
    <div class="t_div">
      <img src="https://cdn.tmooc.cn/bsfile//courseImg///00c7d36bf7a24045950fbfcf9a7dc436.jpg" alt="">
    </div>
    <div class="b_div">
      <a href="">Java高薪项目实战营</a>
      <div>
        <span class="free_span">免费</span>
        <span class="count_span">5,203报名</span>
      </div>
    </div>
  </li>
  <li>
    <div class="t_div">
      <img src="https://cdn.tmooc.cn/bsfile//courseImg///e4298f14fbd946d2bf8d4ba399379dd0.jpg" alt="">
    </div>
    <div class="b_div">
      <a href="">Java高薪项目实战营</a>
      <div>
        <span class="free_span">免费</span>
        <span class="count_span">5,203报名</span>
      </div>
    </div>
  </li>
  <li>
    <div class="t_div">
      <img src="https://cdn.tmooc.cn/bsfile//courseImg///2a7f107a663148849af04f5985934186.jpg" alt="">
    </div>
    <div class="b_div">
      <a href="">Java高薪项目实战营</a>
      <div>
        <span class="free_span">免费</span>
        <span class="count_span">5,203报名</span>
      </div>
    </div>
  </li>

</ul>
</body>
</html>